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Morphological Variation and Discriminating Traits of Kersting's Morphological Variation and Discriminating Traits of Kersting’s Groundnut Accessions Gilles Y. Chodaton University of Abomey Faculty of Agricultural Sciences: Universite d'Abomey-Calavi Faculte des Sciences Agronomiques Eric Etchikinto Agoyi ( [email protected] ) University of Abomey Faculty of Agricultural Sciences: Universite d'Abomey-Calavi Faculte des Sciences Agronomiques Thomas A. Houndété Institut National des Recherches Agronomiques Konoutan M. Kafoutchoni Universite d'Abomey-Calavi Faculte des Sciences et Techniques Hospice S. Sossou University of Abomey Faculty of Agricultural Sciences: Universite d'Abomey-Calavi Faculte des Sciences Agronomiques Fréjus A.K. Sodédji Korean Advanced Institute of Science: Korea Advanced Institute of Science and Technology Sergino Ayi University of Abomey Faculty of Agricultural Sciences: Universite d'Abomey-Calavi Faculte des Sciences Agronomiques Symphorien Agbahoungba University of Abomey Faculty of Agricultural Sciences: Universite d'Abomey-Calavi Faculte des Sciences Agronomiques Flora J. Chadare UNA: Universite Nationale d'Agriculture Appolinaire Adandonon UNA: Universite Nationale d'Agriculture Raymond Vodouhè Bioversity International: Alliance of Bioversity International and International Center for Tropical Agriculture Achille E. Assogbadjo University of Abomey Faculty of Agricultural Sciences: Universite d'Abomey-Calavi Faculte des Sciences Agronomiques Brice A. Sinsin University of Abomey Faculty of Agricultural Sciences: Universite d'Abomey-Calavi Faculte des Sciences Agronomiques Research Article Keywords: Descriptors, diversity, Kersting’s groundnut, Macrotyloma geocarpum, orphan crops Posted Date: August 9th, 2021 DOI: https://doi.org/10.21203/rs.3.rs-671485/v1 License: This work is licensed under a Creative Commons Attribution 4.0 International License. Read Full License 1 Morphological variation and discriminating traits of Kersting’s groundnut accessions 2 Gilles Y. Chodaton1,2, Eric E. Agoyi1*, Thomas A. Houndété4, Konoutan M. Kafoutchoni1, Hospice S. 3 Sossou1, Fréjus A.K. Sodédji1, Sergino Ayi1, Symphorien Agbahoungba1, Flora J. Chadare5, Appolinaire 4 Adandonon2, Raymond Vodouhè3, Achille E. Assogbadjo1, Brice A. Sinsin1 5 6 1Non-Timber Forest Products and Orphan Crop Species Unit, Laboratory of Applied Ecology, Faculty of 7 Agronomic Sciences, University of Abomey-Calavi, 01 BP 526, Tri postal, Cotonou, Benin; 8 2School of Crop and Seeds Production and Management, National University of Agriculture; BP 43 Kétou, Tel: 9 (229) 21 00 29 98 10 3Benin-Bioversity International ; Tel: 21 35 01 88 / 21 35 06 00, 11 4Centre de Recherches Agricoles Coton et Fibres, Institut National des Recherches Agricoles du Bénin, 01 BP 12 175, Cotonou, Bénin 13 5 School of Sciences and Techniques for Preservation and Processing of Agricultural products, National 14 University of Agriculture, P. O. Box 114, Sakété, Benin. 15 *Corresponding author: [email protected] 16 phone: (+229) 97 98 97 45/ 95 19 90 55, 17 ORCID-ID: https://orcid.org/0000-0003-1659-6534 18 19 Authors 20 Gilles Y. Chodaton: Non-Timber Forest Products and Orphan Crop Species Unit, Laboratory of Applied Ecology, 21 Faculty of Agronomic Sciences, University of Abomey-Calavi, 01 BP 526, Tri postal, Cotonou, Benin. 22 ([email protected]) 23 Eric Etchikinto Agoyi*: Non-Timber Forest Products and Orphan Crop Species Unit, Laboratory of Applied 24 Ecology, Faculty of Agronomic Sciences, University of Abomey-Calavi, 01 BP 526, Tri postal, Cotonou, Benin. 25 (*Corresponding author: [email protected]; ORCID-ID: https://orcid.org/0000-0003-1659-6534) 26 Thomas A. Houndété: Centre de Recherches Agricoles Coton et Fibres, Institut National des Recherches 27 Agricoles du Bénin, 01 BP 175, Cotonou, Bénin. ([email protected]) 28 Konoutan M. Kafoutchoni: Non-Timber Forest Products and Orphan Crop Species Unit, Laboratory of Applied 29 Ecology, Faculty of Agronomic Sciences, University of Abomey-Calavi, 01 BP 526, Tri postal, Cotonou, Benin. 30 ([email protected]; https://orcid.org/0000-0002-9153-4272) 31 Hospice S. Sossou: Non-Timber Forest Products and Orphan Crop Species Unit, Laboratory of Applied Ecology, 32 Faculty of Agronomic Sciences, University of Abomey-Calavi, 01 BP 526, Tri postal, Cotonou, Benin. 33 ([email protected]) 34 Fréjus Ariel Kpèdétin Sodédji: Non-Timber Forest Products and Orphan Crop Species Unit, Laboratory of 35 Applied Ecology, Faculty of Agronomic Sciences, University of Abomey-Calavi, 01 BP 526, Tri postal, Cotonou, 36 Benin. ([email protected] http://orcid.org/0000-0003-3450-3346) 37 Sergino Ayi: Non-Timber Forest Products and Orphan Crop Species Unit, Laboratory of Applied Ecology, 38 Faculty of Agronomic Sciences, University of Abomey-Calavi, 01 BP 526, Tri postal, Cotonou, Benin. 39 ([email protected]) 40 Symphorien Agbahoungba: Non-Timber Forest Products and Orphan Crop Species Unit, Laboratory of Applied 41 Ecology, Faculty of Agronomic Sciences, University of Abomey-Calavi, 01 BP 526, Tri postal, Cotonou, Benin. 42 ([email protected]) 1 43 Flora J. Chadare: School of Sciences and Techniques for Preservation and Processing of Agricultural products, 44 National University of Agriculture, P. O. Box 114, Sakété, Benin. ([email protected]) 45 Appolinaire Adandonon: School of Crop and Seeds Production and Management, National University of 46 Agriculture; BP 43 Kétou, Tel: (229) 21 00 29 98. ([email protected]) 47 Raymond Vodouhè: Benin-Bioversity-International; Tel: 21 35 01 88 / 21 35 06 00. ([email protected]) 48 Achille E. Assogbadjo: Non-Timber Forest Products and Orphan Crop Species Unit, Laboratory of Applied 49 Ecology, Faculty of Agronomic Sciences, University of Abomey-Calavi, 01 BP 526, Tri postal, Cotonou, Benin. 50 ([email protected]) 51 Brice A. Sinsin: Non-Timber Forest Products and Orphan Crop Species Unit, Laboratory of Applied Ecology, 52 Faculty of Agronomic Sciences, University of Abomey-Calavi, 01 BP 526, Tri postal, Cotonou, Benin. 53 ([email protected] ) 2 54 Abstract 55 Kersting’s groundnut [Macrotyloma geocarpum (Harms) Maréchal & Baudet] (KG) is a nutritious, subterranean 56 grain legume in West and Central Africa. Only limited information is available on the morphological traits that 57 can discriminate accessions; without such information, appropriate breeding strategies cannot be devised. This 58 study aimed to identify discriminating traits and assess the diversity among accessions of Kersting’s groundnut. 59 Eighty-one KG accessions from Benin and Burkina Faso were evaluated based on 29 qualitative and quantitative 60 traits. An experiment was conducted using an Alpha lattice design with three replications. Standardized Shannon- 61 Weaver index (H') and descriptive statistics were calculated for qualitative traits. Pearson correlation coefficients, 62 stepwise discriminant analysis, principal component analysis, cluster analysis and canonical discriminant analysis 63 were conducted. Results showed that accessions varied greatly based on growth habit (H'= 0.68), flower color (H' 64 = 0.50), seed-eye shape (H' = 0.47), and stem pigmentation (H' = 0.41). Eight quantitative traits, viz., seed width, 65 seed thickness, number of branches per plant, petiole length, days to 50% flowering, number of seeds per pod, pod 66 width, and pod length, were found to significantly discriminate the accessions. Accessions were grouped into three 67 clusters based on quantitative traits. Cluster 1 had accessions with late flowering and good vegetative growth, 68 Cluster 2 contained accessions with high germination percentage and Cluster 3 had accessions with high yield 69 performance. Seed length varied greatly among accessions, thus indicating the potential for improving yield via 70 seed size. 71 Keywords: Descriptors, diversity, Kersting’s groundnut, Macrotyloma geocarpum, orphan crops. 72 73 74 75 76 77 3 78 1. Introduction 79 Orphan crops, also known as forgotten or abandoned crops, traditional or underdeveloped crops 80 (Padulosi et al., 2013), are crop species that have received only limited attention from 81 researchers. However, most orphan crops are highly nutritious, climate resilient (Mabhaudhi et 82 al., 2019), and resistant to commonly occurring crop diseases (Andrew et al., 2009). Thus, 83 orphan crops can potentially contribute toward food security and nutritional security, and should 84 receive more research attention. 85 Kersting’s groundnut [Macrotyloma geocarpum (Harms) Maréchal & Baudet)] is a 86 multipurpose legume crop that is widely grown in West Africa and Central Africa (Adu-Gyamfi 87 et al., 2011; Abiola and Oyetayo, 2015). It is reportedly an orphan and underutilized crop 88 species (Adu-Gyamfi et al., 2012; Dansi et al., 2012) that thrives well in semi-arid zones with 89 an annual rainfall of <600 mm (Achigan Dako and Vodouhè, 2006). Kersting’s groundnut has 90 high nutritional value, as it contains 21.3 g protein per 100 g of grain (Ajayi and Oyetayo, 2009). 91 The seed is a rich source of crude protein, with high levels of essential amino acids, such as 92 phenylalanine (3.2/100 g), histidine (2.1/100 g), lysine and methionine (Ajayi and Oyetayo, 93 2009). Seeds have high vitamins contents (Leung et al., 1968). According to Adazebra (2013), 94 Kersting’s groundnut is one of the less-known leguminous crops, but it contributes significantly 95 toward rural nutrition, livelihoods and sustainable development. Highly appreciated in urban 96 areas of Benin, the crop has a high market value; it is the most expensive grain legume
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